A new electromagnetic oscillation phenomenon on vanadium-compensation semi-insulating 4H-SiC PCSS
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摘要:
通过构建光导开关-金属线圈结构，发现了一种关于钒掺光导开关的电磁振荡现象。这种结构中光导开关响应于激光脉冲信号，金属线圈同时感应出振荡的脉冲信号。这种振荡信号的产生与输入偏压、激光能量、脉冲电路元件、光导开关的形状及结构无关，而与开关的输出特性有关。使用光导天线中的电流瞬冲模型可以较好地解释这一物理现象，通过在SiC半导体上制备欧姆接触电极形成光导开关，当超快激光脉冲照射材料表面时生成大量的光生载流子，同时在电极之间施加偏压信号。此时开关内部在电场作用下形成瞬态电流，进而形成电偶极结构，辐射出电磁波，金属线圈接收并产生振荡信号。
Abstract:Constructing a photoconductive semiconductor switch (PCSS)-metal coil structure, we discovered a new phenomenon of electromagnetic oscillation in vanadium-compensation semi-insulating (VCSI) PCSS. Here the PCSS responds to laser pulse and high-voltage signal while the metal coil generates an oscillating voltage pulse envelope signal. The generation of this oscillating signal is not related to the input bias voltage of the PCSS, the pulse circuit components, or the electrode structure of the PCSS, rather it is related to the output characteristic of the PCSS. This physical phenomenon can be explained using the current surge model in photoconducting antenna. Preparing ohmic contact electrode on the silicon carbide material forms the PCSS, which generates a large number of photogenerated carriers when ultra-fast laser pulses irradiate the surface of the material and Simultaneously applies a bias voltage signal between the electrode. At this time inside the PCSS the electric field causes the transient current, radiating electromagnetic wave to the metal coil to generate oscillating signal.
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Key words:
- VCSI 4H-SiC /
- PCSS /
- electromagnetic oscillation /
- current surge model
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Figure 4. Voltage output waveforms of vertical PCSS-1 turn coil module with 5 kV and 10 kV bias voltages
Figure 5. Voltage output waveforms of vertical PCSS-2 turns coil module with 5 kV and 10 kV bias voltages
Figure 6. Voltage output waveforms of vertical PCSS-6 turns coil module with 5 kV and 10 kV bias voltages
Table 1. Vertical PCSS test parameters
Vin/kV Vmax/V Imax/A 3 1960 39.2 5 3152 63.04 7 4423 88.46 9 5490 109.8 11 5882 117.6 13 6823 136.46 
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Table 2. PCSS-Different turns coil test Parameters recorded in
Vin/kV n Vmax/V Imax/A Vmax+c/V N 5 1 2745 54 1070 13 5 2 2530 50 1540 10 5 6 2745 54 186 12 10 1 5713 114 2790 13 10 2 5061 101 2980 10 10 6 5647 112 489 13
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